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https://issues.apache.org/jira/browse/ACCUMULO-3842?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14556735#comment-14556735
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Sean Busbey commented on ACCUMULO-3842:
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{quote}
What we should really have to mimic the API we present is a strongly consistent
means to update configurations. ZooKeeper doesn't keep us from accomplishing
this. We would need to write code to actually get the strong consensus for
ourselves. I know this is very hand-wavy at this point, but I think we're at
the point where this is a problem we need to start thinking about because it's
been a repeated problem for ourselves just in writing reasonable tests for
Accumulo for ~2years now.
{quote}
Once it's finalized, could we leverage the recent HBase procedure store for
this (ref HBASE-12439)?
> [UMBRELLA] Remove non-transient data from ZooKeeper
> ---------------------------------------------------
>
> Key: ACCUMULO-3842
> URL: https://issues.apache.org/jira/browse/ACCUMULO-3842
> Project: Accumulo
> Issue Type: Improvement
> Components: client, tserver
> Reporter: Josh Elser
> Fix For: 1.8.0
>
>
> Wanted to start brainstorming about this.
> We store a lot of persistent data in ZooKeeper that would better stored in
> something backed by HDFS. ZooKeeper can be a very convenient place to store
> persisted data so that it's available to all nodes, but it comes at a price
> and often must be asynchronously accessed to achieve good performance.
> * Table/Namespace configuration
> * Users/Authorizations
> * Problem reports (maybe?)
> * System configuration overrides (maybe?)
> Some benefits we'd see from this:
> * Loss of ZooKeeper doesn't lose table configuration and users.
> * Greatly reduce zookeeper watchers (assume
> watchers=50*num_tables*num_tservers)
> * Consistent updates of table constraints and all other table properties
> The last note is the most important one IMO. The number of test issues alone
> that we've had with constraints not being seen on all servers are bound to
> affect users.
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